Hi,
Thank you for your message.
Have you tried looking into thier emigration? Sometimes more information was given at the port of arrival rather than that of departure. If you can find their immigration records you may be lucky and find inforamtion on place of origin and William's Occupation. For Immigration information in the US check the National Archives at the following address:
http://www.archives.gov/research/immigration/
Another good website for general information on US immigration records is: http://www.irish-genealogy-toolkit.com/US-immigration-records.html
You could use the land records pertaining to Ireland in the 19th century to try to tie them to the Glanworth area. There are two:
The earlier records are The Tithe Applotment Books which were compiled between 1823-1838. If you know either Mary or Williams' parents names you could search for them in this. You can search this here:
http://titheapplotmentbooks.nationalarchives.ie/search/tab/home.jsp
The second is Griffith's Valuation (1848-1864) You can search this here:
http://www.askaboutireland.ie/griffith-valuation/
Another good search website is https://familysearch.org/ This is a huge database of genealogical records complied by the Church of the Latter Day Saints.
Some other websites which you may find helpful are:
The National Archives of Ireland http://www.nationalarchives.ie/genealogy1/genealogy-records/introduction/
The National Library of Ireland http://www.nli.ie/en/family-history-introduction.aspx
The National Archives UK ? genealogy search: http://www.nationalarchives.gov.uk/records/looking-for-person/
The Public Records Office of Northern Ireland http://www.proni.gov.uk/index/family_history.htm
Failte Romhat: ). www.failteromhat.com
Genealogy Links: http://www.genealogylinks.net/uk/ireland/cork/index.html
Alternatively you could contact Mallow Heritage Centre in Cork for assistance. However, a fee may apply. Here are their contact details:
Mallow Heritage Centre,
27-28 Bank Place,
Mallow,
Co. Cork.
Phone: +353(0) 22 50302 Email: mallowheritagecentre@gmail.com
I hope that this is helpful!
Kind regards,
Genealogy Support